this old but i will answer anyway because maybe somebody will looking for the answer:
from suds.client import Client
url = ' wsdl url here'
client = Client(url, username='***', password="***")
then yo do:
print client
and you will find a line like:
Methods (1):
ZGETDETAILS(ns0:char10 CODENUMBER)
and that name is the name you use for call the service , example:
client.service.ZGETDETAILS('CodeNumber'ValueHere)